EP 0260433 A2 19880323 - Multi-address space control method.
Title (en)
Multi-address space control method.
Title (de)
Verfahren zur Steuerung von Mehradressräumen.
Title (fr)
Procédé de commande d'espaces d'adressage multiples.
Publication
Application
Priority
JP 22136686 A 19860919
Abstract (en)
A multi-address space control for use in an information processing system includes accessing a plurality of address spaces (19, 22) produced by different address translation tables based on a selection command (7) for a plurality of leading address registers (5, 6), and comparing (12) a program status word (PSW) key (Pk, 1) with a main storage key (Mk, 11) in a main storage to protect the main storage. The multi-address space control between different address spaces includes a PSW key register for holding the program status work key, a work access key register (2, Wk) capable of arbitrarily designating an access key in accordance with a data transfer instruction, access means for allowing an access to the main storage irrespective of the value of a main storage key (Mk) when the value of the key selected by a selector (3) as an access key from the work access key register and the PSW key register is a predetermined value (K=0), and setting means for accessing the different address spaces by changing-over the plurality of leading address registers and the work access key register and PSW register, detecting an access exception, and setting the predetermined value in the work access key register to judge the work access key as an access key if an access exception is not detected.
IPC 1-7
IPC 8 full level
G06F 12/10 (2006.01); G06F 12/14 (2006.01)
CPC (source: EP US)
G06F 12/1475 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 0260433 A2 19880323; EP 0260433 A3 19900307; EP 0260433 B1 19941109; DE 3750740 D1 19941215; DE 3750740 T2 19950316; JP S6376034 A 19880406; US 4999770 A 19910312
DOCDB simple family (application)
EP 87111608 A 19870811; DE 3750740 T 19870811; JP 22136686 A 19860919; US 8409287 A 19870811